Notes

Synthesis and Biological Activity of Novel 1,3,4-Thiadiazole Thioether Derivatives Containing Pyrimidine Moiety

  • Li Qianmei ,
  • Pang Kaisheng ,
  • Zhao Jianping ,
  • Liu Xinghai ,
  • Weng Jianquan
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  • a. College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310032;
    b. National Center for Natural Products Research, University of Mississippi, Oxford 38677

Received date: 2016-10-17

  Revised date: 2016-12-20

  Online published: 2017-01-17

Supported by

Project supported by the National Natural Science Foundation of China (No. 30900959) and the Public Project of Zhejiang Province (No. 2014C31127).

Abstract

In order to find novel biologically active heterocyclic compounds, fifteen novel 1,3,4-thiadiazole thioether derivatives carrying pyrimidine moiety were prepared by using thiocarbamide and 2,4-pentanedione as the staring materials via cyclization, etherification, hydrazination, cyclization and the last benzylation reaction under microwave irradiation. The structures of the synthesized compounds were characterized by 1H NMR, 13C NMR, IR, ESI-MS and elemental analysis. The preliminary bioassay results indicated that some target compounds exhibited moderate inhibition activity against Colletrotichum acutatum, Colletrotichum gloeosporioides and Colletrotichum fragariae at 50 μg/mL, and the inhibition rate of 2-(((4,6- dimethylpyrimidin-2-yl)thio)methyl)-5-((3-fluorobenzyl)thio)-1,3,4-thiadiazole (7i) against Colletrotichum acutatum and Colletrotichum fragariae were 79.84% and 73.46% respectively. Several compounds also showed good antileishmanial activities against Leishmania donovani, 2-(((4,6-dimethylpyrimidin-2-yl)thio)methyl)-5-((2-fluorobenzyl)thio)-1,3,4-thiadiazole (7h) and 2-(((4,6-dimethylpyrimidin-2-yl)thio)methyl)-5-((4-fluorobenzyl)thio)-1,3,4-thiadiazole (7j) were found highly active with IC50 values of 21.3 and 23.6 μg/mL, respectively.

Cite this article

Li Qianmei , Pang Kaisheng , Zhao Jianping , Liu Xinghai , Weng Jianquan . Synthesis and Biological Activity of Novel 1,3,4-Thiadiazole Thioether Derivatives Containing Pyrimidine Moiety[J]. Chinese Journal of Organic Chemistry, 2017 , 37(4) : 1009 -1015 . DOI: 10.6023/cjoc201610026

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